In Hibernate 4 the informix datatype serial8 is detected and the id generation is provided by the database. After upgrading to any Hibernate 5 version it tries to use the hibernate_sequence which does not exists.

I'm using the following jpa annotations on my id.

@Id
@GeneratedValue(strategy=GenerationType.AUTO)

Was this change intended? I'm not sure if its a bug...

Greets
Meleagros